WO2019106200A1 - Vaccine against klebsiella pneumoniae - Google Patents
Vaccine against klebsiella pneumoniae Download PDFInfo
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- WO2019106200A1 WO2019106200A1 PCT/EP2018/083245 EP2018083245W WO2019106200A1 WO 2019106200 A1 WO2019106200 A1 WO 2019106200A1 EP 2018083245 W EP2018083245 W EP 2018083245W WO 2019106200 A1 WO2019106200 A1 WO 2019106200A1
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- compound
- oligosaccharide
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- C—CHEMISTRY; METALLURGY
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Definitions
- the present invention relates to a synthetic oligosaccharide of general formula (I) that is related to Klebsiella pneumoniae serotype O3, O3b and/or O5 lipopolyoligosaccharide specifically the O-antigens and conjugate thereof.
- Said synthetic oligosaccharide, said conjugate and pharmaceutical composition containing said synthetic oligosaccharide or said conjugate are useful for prevention and/or treatment of diseases associated with Klebsiella pneumoniae, more specifically of diseases associated with Klebsiella pneumoniae serotype O3, O3b and/or O5.
- the synthetic oligosaccharide of general formula (I) is useful as marker in immunological assays for detection of antibodies against Klebsiella pneumoniae bacteria.
- Klebsiella pneumoniae is a gram-negative, facultative anaerobic, rod-shaped bacterium colonizing mostly the respiratory and urinary tracts and causing K. pneumoniae infections (KPIs).
- KPI is the main cause of nosocomial infections, primarily affecting immunocompromised patients.
- infections caused by K. pneumoniae are becoming an important challenge in health-care settings due to the emergence of strains resistant to almost all available antimicrobial agents and their worldwide dissemination. Infections caused by Klebsiella pneumoniae are responsible for high rates of morbidity and mortality.
- prevention of infections caused by K. pneumoniae is highly desirable, and vaccination of risk groups is the most cost-efficient and the most powerful means.
- K. pneumoniae is highly desirable, and vaccination of risk groups is the most cost-efficient and the most powerful means.
- pneumoniae bacteria typically express two types of antigens on their cell surfaces.
- the first, O-antigen is a component of the lipopolyoligosaccharide (LPS), of which 9 serogroups exist.
- the second is K antigen, a capsular polysaccharide / oligosaccharide with more than 80 serotypes.
- LPS lipopolyoligosaccharide
- K antigen a capsular polysaccharide / oligosaccharide with more than 80 serotypes.
- the O-antigen is the most variable portion of the LPS and provides serological specificity, which together with the K antigen is used for serotyping.
- Both antigens are composed of complex polysaccharide / oligosaccharides on the bacterial surface, which are highly immunogenic and nontoxic. In comparison with proteins, carbohydrates are evolutionarily more stable.
- oligosaccharide antigens When covalently connected to a carrier protein, oligosaccharide antigens can elicit long lasting, T-cell-dependent protection vaccines see Chem. & Biol. 2014, 21, 38–50.
- WO 2016/156338 A1 discloses synthetic carbapenem-resistant Klebsiella pneumoniae oligosaccharides and conjugates thereof for the treatment of diseases caused by Klebsiella pneumoniae bacteria.
- the article Vaccine 1986, 4, 15 reports on a hexavalent Klebsiella vaccine composed of the capsular polysaccharide derived from K2, K3, K10, K21, K30 and K55 serotypes.
- the tested vaccine was found to be highly protective against fatal experimental Klebsiella K2 burn wound sepsis, thus indicating that functional antibody is elicited following vaccination.
- the repeating unit of the O-antigens, i.e. O-polysaccharides of K. pneumoniae was elucidated (The Journal of Biological Chemistry, 2002, 277 (28), 25070-25081) (see Figure 1).
- the repeating unit of the O-polysaccharide of K. pneumoniae serotype O3 consists of:
- the repeating unit of the O-polysaccharide of K. pneumoniae serotype O3b consists of:
- the repeating unit of the O-polysaccharide of K. pneumoniae serotype O5 consists of:
- a protective immunogenic O-antigen epitope i.e. a O-antigen epitope that elicits antibodies which protect against diseases caused by Klebsiella pneumoniae serotype O3, O3b and serotype O5.
- Said oligosaccharide can be conjugated to an immunogenic carrier to provide a conjugate and pharmaceutical composition thereof that are useful for prevention and/or treatment of diseases associated with Klebsiella pneumoniae serotype O3, O3b and serotype O5.
- the synthetic oligosaccharide of general formula (I) is useful as marker in immunological assays for detection of antibodies against Klebsiella pneumoniae bacteria.
- linker encompasses molecular fragments capable of connecting the reducing-end monosaccharide of an oligosaccharide with an immunogenic carrier or a solid support, optionally by binding to at least one interconnecting molecule.
- the function of the linker per se or together with the interconnecting molecule is to establish, keep and/or bridge a special distance between the reducing-end monosaccharide and an immunogenic carrier or a solid support.
- linker provides greater efficiency of coupling with oligosaccharides by reducing steric hindrance of reactive groups (Methods in Molecular Medicine 2003, 87, 153-174). More specifically, one extremity of the linker is connected to the exocyclic oxygen atom at the anomeric center of the reducing-end monosaccharide and the other extremity is connected via the nitrogen atom with the interconnecting molecule, or directly with the immunogenic carrier or the solid support.
- Any linker for oligosaccharide conjugates e.g. polysaccharide and oligosaccharide- carrier protein conjugate, antibody-drug conjugate
- linker for oligosaccharide conjugates e.g. polysaccharide and oligosaccharide- carrier protein conjugate, antibody-drug conjugate
- Such suitable linkers are harmless (i.e. non-toxic) and non-immunogenic (i.e. do not lead to the formation of nonprotective antibodies on immunization with a conjugate) and include but are not Controlled Release 2013, 172, 382-389, J. Immun. Meth. 1996, 191, 1-10), glutaric acid derivatives (J. Org. Chem.
- adipic acid derivatives such as the commercially available MFCO-NHS (monofluoro-substituted cyclooctyne N-hydroxysuccinimide ester), maleimides (as disclosed in Acc Chem Res 2017, 50, 1270-1279), or hydrophilic alkyl phosphinates and sulfonyls (as described in WO2014080251A1).
- interconnecting molecule refers to a bifunctional molecule containing functional group X and functional group Y, wherein functional group X is capable of reacting with the terminal amino group on the linker L and the functional group Y is capable of reacting with a functionality present on an immunogenic carrier or on a solid support.
- Figure 3 displays examples of commercially available interconnecting molecules, but does not restrict the interconnecting molecules that can be used according to the present invention to the examples displayed herein.
- adjuvant refers to an immunological adjuvant i.e.
- adjuvants include:
- calcium salts include calcium phosphate.
- Aluminium salts include hydroxides, phosphates, sulfates, etc., with the salts taking any suitable form (e.g. gel, crystalline, amorphous, etc.). Adsorption to these salts is preferred.
- the mineral containing compositions may also be formulated as a particle of metal salt.
- the adjuvants known as aluminium hydroxide and aluminium phosphate may be also used.
- the invention can use any of the "hydroxide” or "phosphate” adjuvants that are in general used as adjuvants.
- the adjuvants known as "aluminium hydroxide” are typically aluminium oxyhydroxide salts, which are usually at least partially crystalline.
- the adjuvants known as "aluminium phosphate” are typically aluminium hydroxyphosphates, often also containing a small amount of sulfate (i. e. aluminium hydroxyphosphate sulfate). They may be obtained by precipitation, and the reaction conditions and concentrations during precipitation influence the degree of substitution of phosphate for hydroxyl in the salt. Mixtures of both an aluminium hydroxide and an aluminium phosphate can be employed in the formulation according to the present invention;
- Saponins which are a heterologous group of sterol glycosides and triterpenoid glycosides that are found in the bark, leaves, stems, roots and even flowers of a wide have been widely studied as adjuvants.
- Saponins can also be commercially obtained from Smilax ornata (sarsaprilla), Gypsophilla paniculata (brides veil), and Saponaria oficianalis (soap root).
- Saponin adjuvant formulations include purified formulations, such as QS21, as well as lipid formulations, such as ISCOMs. Saponin compositions have been purified using HPLC and RP-HPLC.
- ISCOMs immunostimulating complexes
- the ISCOM generally include a phospholipid such as phosphatidylethanolamine or phosphatidylcholine. Any known saponin can be used in ISCOMs.
- the ISCOM includes one or more of QuilA, QHA & QHC;
- microparticles i.e. a particle of 100 nm to 150 pm in diameter, more preferably 200 nm to 30 pm in diameter, or 500 nm to 10 pm in diameter
- materials that are biodegradable and non-toxic.
- non-toxic and biodegradable materials include, but are not restricted to poly( ⁇ -hydroxy acid), polyhydroxybutyric acid, polyorthoester, polyanhydride, polycaprolactone;
- CD1d ligands such as an ⁇ -glycosylceramide, phytosphingosine-containing ⁇ - glycosylceramides, OCH, KRN7000 [(2S,3S,4R)-1-O-( ⁇ -D-galactopyranosyl)-2-(N- hexacosanoylamino)-1,3,4-octadecanetriol], CRONY- 101, 3"-sulfo-galactosyl- ceramide; 7DW8-5 (Funakoshi Co., Ltd.)
- Immunostimulatory oligonucleotides can include nucleotide modifications/analogs such as phosphorothioate modifications and can be double- stranded or (except for RNA) single-stranded;
- each molecule or substance that is able to favor or amplify a particular situation in the cascade of immunological events, ultimately leading to a more pronounced immunological response can be defined as an adjuvant.
- APCs antigen-presenting cells
- APCs antigen-presenting cells
- polysaccharides and oligosaccharides are known by the person skilled in the art as TI-2 (T cell independent-2) antigens and poor immunogens, if they are not zwitterionic. Therefore, to produce a poly-,oligosaccharide-based vaccine, said poly- , oligosaccharides are conjugated to an immunogenic carrier to provide a conjugate, which presents an increased immunogenicity in comparison with the poly-or oligosaccharide.
- the term“immunogenic carrier” is defined as a structure, which is conjugated to the poly-, oligosaccharide to form a conjugate that presents an increased immunity in comparison with the poly-,oligosaccharide per se.
- the conjugation of the oligosaccharides to the immunogenic carrier preferably protein carrier, has an effect of stimulating the immune response against said oligosaccharide, without inducing an immune response against the said immunogenic carrier.
- the present invention is directed to an oligosaccharide of general formula (I) T*–[(–U x+4 –U x+3 –U x+2 –U x+1 –U x ) m –(V x+2 –V x+1 –V x ) 1-m ] n –T–O–L–E
- n is an integer selected from 0 and 1;
- x is an integer selected from 1 to 2 ⁇ m + 3;
- n is an integer selected from 1, 2, 3, 4, 5, 6 ,7 ,8, 9 and 10;
- –T— represents a bond, —(U x+4 ) m –(V x+2 ) 1-m –, –(U x+4 –U x+3 ) m –(V x+2 –V x+1 ) 1-m –, –(U x+4 –U x+3 –U x+2 ) m – or –(U x+4 –U x+3 –U x+2 –U x+1 ) m – ;
- T*– represents H–, H–(U x ) m –(V x ) 1-m —, H–(U x+1 –U x ) m –(V x+1 –V x ) 1-m —, H–(U x+2 –U x+1 –U x ) m — or H–(U x+3 –U x+2 –U x+1 –U x ) m – ;
- L represents a linker
- R ⁇ represents —H, –Me, –Et, 4-nitrophenyl, pentafluorophenyl, –N-hydroxysuccinimidyl, –(3-sulfo-N-hydroxysuccinimidyl), or –(dibenzocyclooctyne-sulfo-N-hydroxysuccinimidyl);
- the linker L preferably contains between 2 and 40 carbon atoms (including the carbon atoms of optional side chains), more preferably between 2 and 30, more preferably between 2 and 20, more preferably between 2 and 14, more preferably between 2 and 12, and still more preferably between 2 and 10 carbon atoms.
- the shortest atom chain between the oxygen atom (i.e. the oxygen of–O–L–E) and the E-group consists preferably of 2 to 14 atoms, more preferably of 2 to 12 atoms, more preferably of 2 to 10 atoms, more preferably of 2 to 8 atoms.
- the shortest chain (which is the shortest possible connection between the oxygen at the anomeric center and the NH 2 -group) consists of 2 to 6 atoms, these are preferably carbon atoms. In case the shortest chain consists of 4 to 8 atoms, the chain may contain 1 or 2 heteroatoms selected from O, N and S. In case the shortest chain consists of 9 to 14 atoms, the chain may contain 1, 2, 3, or 4 heteroatoms selected from O, N and S. It is also preferred that the linker–L–, or the shortest chain is fully or partially fluorinated.
- the linker–L– may contain a 3-membered or a 4-membered or a 5- membered or a 6-membered saturated carbocycle or a 5-membered partly unsaturated (and not aromatic) carbocycle or a 4-membered or a 5-membered or a 6-membered saturated oxygen heterocycle or a 4-membered or a 5-membered or a 6-membered saturated nitrogen heterocycle or a 6-membered aromatic carbocycle.
- the linker –L– may also contain amide (–NH–CO–, –CO–NH–) and/or urea (–NH–CO–NH–) residues and preferably only one amide or urea residue.
- the linker may also contain substituents and preferably two substituents such as R10 and R11 or four substituents such as R10, R11 , R15 and R14 , which have the meanings as defined herein and which are preferably selected from: –F, –Cl, –CH 3 , –C 2 H 5 , –C 3 H 7 , –C 5 H 9 , –C 6 H 13 , –OCH 3 , –OC 2 H 5 , –CH 2 F, –CHF 2 , –CF 3 , –C(O)–NH 2 , –SCH 3 , –SC 2 H 5 , –NHC(O)CH 3 , –N(CH 3 ) 2 , and–N(C 2 H 5 ) 2 .
- the linker–L– is fluorinated, more than two substituents–F are preferred.
- the linker–L– is selected from: –CH 2 –, –(CH 2 ) 2 –, –(CH 2 ) 3 –, –(CH 2 ) 4 –, –(CH 2 ) 5 –, –(CH 2 ) 6 –, –(CH 2 ) 7 –, –(CH 2 ) 8 –, –(CH 2 ) 9 –, –(CH 2 ) 10 –, –CF 2 –, –(CF 2 ) 2 –, –(CF 2 ) 3 –, –(CF 2 ) 4 –, –(CF 2 ) 5 –, –(CF 2 ) 6 –, –(CF 2 ) 7 –, –(CF 2 ) 8 –, –(CF 2 ) 9 –, –(CF 2 ) 10 –, –(CH 2 )
- –La– is selected from: –(CH 2 ) o –, –(CF 2 ) o –, –(CH 2 –CH 2 –O) o –C 2 H 4 –, –(CH 2 –CH 2 –O) o –CH 2 –, –(CR10R11) o –,
- –Lb– and –Lc— are independently of each other selected from: –O–,
- –Le— is selected from: –(CH 2 ) p1 –, –(CF 2 ) p1 –, –C 2 H 4 –(O–CH 2 –CH 2 ) p1 –, –CH 2 –(O–CH 2 –CH 2 ) p1 –, –(CH 2 ) p1 –O–(CH 2 ) p2 –, –(CR14R15) p1 –, –(CR14R15) p1 –O–(CR21R22) p2 –,
- R9 and R18 are independently of each other selected from: –CH 3 , –C 2 H 5 , –C 3 H 7 and –C(O)CH 3 ;
- R10, R11 , R12 , R13, R14 , R15, R16, R17 , R19, R20, R21 and R22 are independently of each other selected from: –H, –F, –Cl, –CH 3 , –C 2 H 5 , –C 3 H 7 , –C 5 H 9 , –C 6 H 13 , –OCH 3 , –OC 2 H 5 , –CH 2 F, –CHF 2 , –CF 3 , –C(O)–NH 2 , –SCH 3 , –SC 2 H 5 , –NHC(O)CH 3 , –N(CH 3 ) 2 and –N(C 2 H 5 ) 2 ;
- o, q, p1 and p2 are independently of each other an integer selected from 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10. More preferred,–L– represents –La–, –La–Le–, –La–Lb–Le–, or –La–Ld–Le–; –La– represents–(CH 2 ) o –,–(CH 2 –CH 2 –O) o –C 2 H 4 –, or–(CH 2 –CH 2 –O) o –CH 2 ;
- –Lb— represents –O–, –NH–CO–NH–, –NH–CO–CH 2 –NH–, –NH–CO—;
- –Ld— represents –(CH 2 ) q –, –(CH(OH)) q –, –(CF 2 ) q –, –(CH 2 –CH 2 –O) q –C 2 H 4 –, or –(CH 2 –CH 2 –O) q –CH 2 –;
- oligosaccharide of the formula (I) has the group–O-L-E selected from the group consisting of:
- R ⁇ represents –H, –Me, –Et, 4-nitrophenyl, pentafluorophenyl, –N-hydroxysuccinimidyl, –(3-sulfo-N-hydroxysuccinimidyl), or –(dibenzocyclooctyne-sulfo-N-hydroxysuccinimidyl);
- X represents –Br, –Cl, –I, –CO 2 H, or –SAc.
- n is an integer selected from 0 and 1;
- x is an integer selected from 1 to 2 ⁇ m + 3;
- n is an integer selected from 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10; preferably n is an integer selected from 1, 2, 3, 4, 5, 6, 7, and 8; more preferably n is an integer selected from 1, 2, 3, 4, 5, and 6; still more preferably n is an integer selected from 1, 2, 3, and 4; still more preferably n is an integer selected from 1, 2, and 3; still more preferably n is an integer selected from 1 and 2;
- –T— represents a bond, —(U x+4 ) m –(V x+2 ) 1-m –, –(U x+4 –U x+3 ) m –(V x+2 –V x+1 ) 1-m –, –(U x+4 –U x+3 –U x+2 ) m – or –(U x+4 –U x+3 –U x+2 –U x+1 ) m – ;
- T*– represents H–, H–(U x ) m –(V x ) 1-m —, H–(U x+1 –U x ) m –(V x+1 –V x ) 1-m —, H–(U x+2 –U x+1 –U x ) m — or H–(U x+3 –U x+2 –U x+1 –U x ) m – ;
- L represents —La–, –La–Le–, –La–Lb–Le–, or –La–Ld–Le–;
- –La– represents–(CH 2 ) o –,–(CH 2 –CH 2 –O) o –C 2 H 4 –, or–(CH 2 –CH 2 –O) o –CH 2 ;
- –Lb— represents –O–, –NH–CO–NH–, –NH–CO–CH 2 –NH–, –NH–CO—;
- –Ld— represents –(CH 2 ) q –, –(CH(OH)) q –, –(CF 2 ) q –, –(CH 2 –CH 2 –O) q –C 2 H 4 –, or –(CH 2 –CH 2 –O) q –CH 2 –;
- –Le– represents –(CH 2 ) p1 –, –(CF 2 ) p1 –, –C 2 H 4 –(O–CH 2 –CH 2 ) p1 –, –CH 2 –(O–CH 2 –CH 2 ) p1 – or –(CH 2 ) p1 –O–(CH 2 ) p2 –; and
- o, q, p1 and p2 are independently of each other an integer selected from 1, 2, 3, 4, 5, and 6; preferably an integer selected from 1, 2, 3, and 4.
- R ⁇ represents —H, –Me, –Et, 4-nitrophenyl, pentafluorophenyl, –N-hydroxysuccinimidyl, –(3-sulfo-N-hydroxysuccinimidyl), or –(dibenzocyclooctyne-sulfo-N-hydroxysuccinimidyl);
- the anomers of oligosaccharides of the present invention mean the ⁇ / ⁇ -anomers at C-1-postion to which the group–O-L-E is bounded. It is clear for the skilled person in the art of carbohydrate chemistry that the stereochemistry of the glycosidic bond is defined by the stereochemistry indicated for the anomeric center of the sugar fragments U 1 , U 2 , U 3 , U 4 , U 5 , U 6 , U 7 , U 8 , U 9 , V 1 , V 2 , V 3 , V 4 , and V 5 , in the general formula (I).
- the oligosaccharides of the present invention can be hygroscopic and thus can build various hydrates thereof.
- Preferred, molar ratio of water molecule to the oligosaccharide is in the range of 1 to 20, more preferred, 1 to 10, most preferred, 5- 10.
- the oligosaccharides of the present invention may bear basic and/or acidic substituents and they may form salts with organic or inorganic acids or bases
- suitable acids for such acid addition salt formation are hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid, acetic acid, citric acid, oxalic acid, malonic acid, salicylic acid, p-aminosalicylic acid, malic acid, fumaric acid, succinic acid, ascorbic acid, maleic acid, sulfonic acid, phosphonic acid, perchloric acid, nitric acid, formic acid, propionic acid, gluconic acid, lactic acid, tartaric acid, hydroxymaleic acid, pyruvic acid, phenylacetic acid, benzoic acid, p-aminobenzoic acid, p-hydroxybenzoic acid, methanesulfonic acid, ethanesulfonic acid, nitrous acid, hydroxyethanesulfonic acid,
- the salts are prepared by contacting the free base form with a sufficient amount of the desired acid to produce a salt in the conventional manner.
- suitable inorganic or organic bases are, for example, NaOH, KOH, NH 4 OH, tetraalkylammonium hydroxide, lysine or arginine and the like.
- Salts may be prepared in a conventional manner using methods well known in the art, for example by treatment of a solution of the compound of the general formula (I) with a solution of a base, selected out of the group mentioned above. It is clear for the skilled person in the art of carbohydrate chemistry that the oligosaccharides of general (I) are not containing–O–O– bonds and or sugar fragments
- oligosaccharide of general formula (I) contains an immunogenic protective epitope and is able to induce a protective immune response against K. pneumoniae serotype O3, O3b and/or O5 bacteria in a human and/or animal host.
- the oligosaccharide of general formula (I) elicits antibodies that are cross-reacting with the natural K.
- oligosaccharides of the present invention overcome all the problems associated thereof in terms of purity and easiness of production. It is well known that the isolation and purification of pure oligosaccharides of defined length and structure from the O-antigen of lipopolysaccharides of pathogenic bacteria is a tedious and sometimes not feasible process.
- x is an integer selected from 1, 2 or 3;
- n is an integer selected from 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10; preferably n is an integer selected from 1, 2, 3, 4, 5, 6, 7, and 8; more preferably n is an integer selected from 1, 2, 3, 4, 5, and 6; still more preferably n is an integer selected from 1, 2, 3, and 4; still more preferably n is an integer selected from 1, 2, and 3; still more preferably n is an integer selected from 1 and 2;
- –T— represents a bond, —(U x+4 ) m –(V x+2 ) 1-m –, –(U x+4 –U x+3 ) m –(V x+2 –V x+1 ) 1-m –, –(U x+4 –U x+3 –U x+2 ) m – or –(U x+4 –U x+3 –U x+2 –U x+1 ) m – ;
- T*– represents H–, H–(U x ) m –(V x ) 1-m —, H–(U x+1 –U x ) m –(V x+1 –V x ) 1-m —, H–(U x+2 –U x+1 –U x ) m — or H–(U x+3 –U x+2 –U x+1 –U x ) m – ;
- L represents —La–, –La–Le–, –La–Lb–Le–, or –La–Ld–Le–;
- –La– represents–(CH 2 ) o –,–(CH 2 –CH 2 –O) o –C 2 H 4 –, or–(CH 2 –CH 2 –O) o –CH 2 ;
- –Lb— represents –O–, –NH–CO–NH–, –NH–CO–CH 2 –NH–, –NH–CO—;
- –Ld— represents –(CH 2 ) q –, –(CH(OH)) q –, –(CF 2 ) q –, –(CH 2 –CH 2 –O) q –C 2 H 4 –, or –(CH 2 –CH 2 –O) q –CH 2 –;
- –Le– represents –(CH 2 ) p1 –, –(CF 2 ) p1 –, –C 2 H 4 –(O–CH 2 –CH 2 ) p1 –, –CH 2 –(O–CH 2 –CH 2 ) p1 – or –(CH 2 ) p1 –O–(CH 2 ) p2 –; and
- o, q, p1 and p2 are independently of each other an integer selected from 1, 2, 3, 4, 5, and 6; preferably an integer selected from 1, 2, 3, and 4.
- R ⁇ represents —H, –Me, –Et, 4-nitrophenyl, pentafluorophenyl, –N-hydroxysuccinimidyl, –(3-sulfo-N-hydroxysuccinimidyl), or –(dibenzocyclooctyne-sulfo-N-hydroxysuccinimidyl);
- x is an integer selected from 1, 2, 3, 4 or 5; n is an integer selected from 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10; preferably n is an integer selected from 1, 2, 3, 4, 5, 6, 7, and 8; more preferably n is an integer selected from 1, 2, 3, 4, 5, and 6; still more preferably n is an integer selected from 1, 2, 3, and 4; still more preferably n is an integer selected from 1, 2, and 3; still more preferably n is an integer selected from 1 and 2;
- –T— represents a bond, —(U x+4 ) m –(V x+2 ) 1-m –, –(U x+4 –U x+3 ) m –(V x+2 –V x+1 ) 1-m –, –(U x+4 –U x+3 –U x+2 ) m – or –(U x+4 –U x+3 –U x+2 –U x+1 ) m – ;
- T*– represents H–, H–(U x ) m –(V x ) 1-m —, H–(U x+1 –U x ) m –(V x+1 –V x ) 1-m —, H–(U x+2 –U x+1 –U x ) m — or H–(U x+3 –U x+2 –U x+1 –U x ) m – ;
- L represents —La–, –La–Le–, –La–Lb–Le–, or –La–Ld–Le–;
- –La– represents–(CH 2 ) o –,–(CH 2 –CH 2 –O) o –C 2 H 4 –, or–(CH 2 –CH 2 –O) o –CH 2 ;
- –Lb— represents –O–, –NH–CO–NH–, –NH–CO–CH 2 –NH–, –NH–CO—;
- –Ld— represents –(CH 2 ) q –, –(CH(OH)) q –, –(CF 2 ) q –, –(CH 2 –CH 2 –O) q –C 2 H 4 –, or –(CH 2 –CH 2 –O) q –CH 2 –;
- –Le– represents –(CH 2 ) p1 –, –(CF 2 ) p1 –, –C 2 H 4 –(O–CH 2 –CH 2 ) p1 –, –CH 2 –(O–CH 2 –CH 2 ) p1 – or –(CH 2 ) p1 –O–(CH 2 ) p2 –; and
- o, q, p1 and p2 are independently of each other an integer selected from 1, 2, 3, 4, 5, and 6; preferably an integer selected from 1, 2, 3, and 4.
- R ⁇ represents —H, –Me, –Et, 4-nitrophenyl, pentafluorophenyl, –N-hydroxysuccinimidyl, –(3-sulfo-N-hydroxysuccinimidyl), or –(dibenzocyclooctyne-sulfo-N-hydroxysuccinimidyl);
- n is an integer selected from 0 and 1;
- x is an integer selected from 1 to 2 ⁇ m + 3;
- n is an integer selected from 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10; preferably n is an integer selected from 1, 2, 3, 4, 5, 6, 7, and 8; more preferably n is an integer selected from 1, 2, 3, 4, 5, and 6; still more preferably n is an integer selected from 1, 2, 3, and 4; still more preferably n is an integer selected from 1, 2, and 3; still more preferably n is an integer selected from 1 and 2;
- L represents —La–, –La–Le–, –La–Lb–Le–, or –La–Ld–Le–;
- –La– represents–(CH 2 ) o –,–(CH 2 –CH 2 –O) o –C 2 H 4 –, or–(CH 2 –CH 2 –O) o –CH 2 ;
- –Lb— represents –O–, –NH–CO–NH–, –NH–CO–CH 2 –NH–, –NH–CO—;
- –Ld— represents –(CH 2 ) q –, –(CH(OH)) q –, –(CF 2 ) q –, –(CH 2 –CH 2 –O) q –C 2 H 4 –, or –(CH 2 –CH 2 –O) q –CH 2 –;
- –Le– represents –(CH 2 ) p1 –, –(CF 2 ) p1 –, –C 2 H 4 –(O–CH 2 –CH 2 ) p1 –, –CH 2 –(O–CH 2 –CH 2 ) p1 – or –(CH 2 ) p1 –O–(CH 2 ) p2 –; and
- o, q, p1 and p2 are independently of each other an integer selected from 1, 2, 3, 4, 5, and 6; preferably an integer selected from 1, 2, 3, and 4.
- R ⁇ represents –H, –Me, –Et, 4-nitrophenyl, pentafluorophenyl, N hydroxysuccinimidyl (3 sulfo N hydroxysuccinimidyl) or –(dibenzocyclooctyne-sulfo-N-hydroxysuccinimidyl);
- n, L, E, U x+1 , U x+2 , U x+3 , U x+4 , V x , V x+1 , V x+2 and T* have the meanings as defined herein.
- an oligosaccharide of general formula (III-a), (III-b), (III-c), (III-d), (III-e), (III-f), (III-g), (III-h), (III-i), (III-j) and (III-k) wherein n, L, E and T* have the meanings defined herein is especially preferred.
- n represents an integer selected from 2 to 10, preferably from 1 to 8, more preferably from 1 to 6, still more preferably from 1 to 4, still more preferably from 1 to 3, still more preferably 1 or 2.
- the linker–L– represents–La–,–La–Le–,–La–Lb–Le–, or–La–Ld–Le–;
- –La– represents –(CH 2 ) o –, –(CH 2 –CH 2 –O) o –C 2 H 4 –, or–(CH 2 –CH 2 –O) o –CH 2 ;
- –Lb– represents –O–, –NH–CO—NH–, –NH–CO–CH 2 –NH–, –NH–CO—;
- –Ld— represents –(CH 2 ) q –,–(CH(OH)) q –, –(CF 2 ) q –, –(CH 2 –CH 2 –O) q –C 2 H 4 –, or –(CH 2 –CH 2 –O) q –CH 2 –;
- –Le– represents –(CH 2 ) p1 –, –(CF 2 ) p1 –, –C 2 H 4 –(O–CH 2 –CH 2 ) p1 –, –CH 2 –(O–CH 2 –CH 2 ) p1 – or –(CH 2 ) p1 –O–(CH 2 ) p2 –; and
- –L– represents –La–, –La–Le–, –La–Lb–Le–, or –La–Ld–Le– ;
- –La– represents –(CH 2 ) o –, –(CH 2 –CH 2 –O) o –C 2 H 4 –, or–(CH 2 –CH 2 –O) o –CH 2 ;
- –Lb— represents –O–, –NH–CO–NH–, –NH–CO–CH 2 –NH–, –NH–CO—;
- –Ld— represents –(CH 2 ) q –,–(CH(OH)) q –, –(CF 2 ) q –, –(CH 2 –CH 2 –O) q –C 2 H 4 –, or –(CH 2 –CH 2 –O) q –CH 2 –;
- –Le– represents –(CH 2 ) p1 –, –(CF 2 ) p1 –, –C 2 H 4 –(O–CH 2 –CH 2 ) p1 –, –CH 2 –(O–CH 2 –CH 2 ) p1 – or –(CH 2 ) p1 –O–(CH 2 ) p2 –; and
- –L is selected from: –La–, –La–Le–, –La–Lb–Le–, and –La–Ld–Le–;
- –La— is selected from: –(CH 2 ) o –, –(CH 2 –CH 2 –O) o –C 2 H 4 –,–(CH 2 –CH 2 –O) o –CH 2 ; –Lb— represents –O–, –NH–CO–NH–, –NH–CO–CH 2 –NH–, –NH–CO–;
- –Ld— is selected from:–(CH 2 ) q –, –(CF 2 ) q –, –(CH 2 –CH 2 –O) q –C 2 H 4 –, and –(CH 2 –CH 2 –O) q –CH 2 –;
- –Le— is selected from: –(CH 2 ) p1 –, –(CF 2 ) p1 –, –C 2 H 4 –(O–CH 2 –CH 2 ) p1 –, –CH 2 –(O–CH 2 –CH 2 ) p1 – and –(CH 2 ) p1 –O–(CH 2 ) p2 –;
- o, q, p1 and p2 are independently of each other an integer selected from 1, 2, 3, 4, 5, and 6; preferably an integer selected from 1, 2, 3, and 4; and n represents 1 is also preferred. Even more preferred is a oligosaccharide of general formula (I), (II), (II-a), (II-b), (II-c), (II-d), (II-e), (II-f), (II-g), (II-h), (II-i), (II-j), (II-k), (III), (III-a), (III-b), (III-c), (III-d), (III-e), (III-f), (III-g), (III-h), (III-i), (III-j) or (III-k), wherein–L– represents–(CH 2 ) o – and o is an integer selected from 2, 3, 4, 5 and 6.
- oligosaccharide of general (I), (II), (II-a), (II-b), (II-c), (II-d), (II-e), (II-f), (II-g), (II-h), (II-i), (II-j), (II-k), (III), (III-a), (III-b), (III-c), (III-d), (III-e), (III-f), (III-g), (III-h), (III-i), (III-j) or (III-k), wherein–L– represents–(CH 2 ) o –, o is an integer selected from 2, 3, 4, 5 and 6, and n represents 1.
- –O-L-E is selected from the group consisting of:
- R ⁇ represents –H, –Me, –Et, 4-nitrophenyl, pentafluorophenyl, –N-hydroxysuccinimidyl, –(3-sulfo-N-hydroxysuccinimidyl), or –(dibenzocyclooctyne-sulfo-N-hydroxysuccinimidyl);
- X represents —Br, –Cl, –I, –CO 2 H, or –SAc.
- Particularly preferred,–O-L-E is selected from the group consisting of:
- oligosaccharide of general formula (I), (II), (II-a), (II-b), (II-c), (II-d), (II-e), (II-f), (II-g), (II-h), (II-i), (II-j), (II-k), (III), (III-a), (III-b), (III-c), (III-d), (III-e), (III-f), (III-g), (III-h), (III-i), (III-j) or (III-k), wherein–L– represents–(CH 2 ) o –, o is an integer selected from 2, 3, 4, 5 and 6 E represents an amino group.
- the oligosaccharide according to the present invention is selected from the group consisting of:
- Another aspect of the present invention is directed to a method of synthesis of an oligosaccharide of general formula (I) T*–[(–U x+4 –U x+3 –U x+2 –U x+1 –U x ) m –(V x+2 –V x+1 –V x ) 1-m ] n –T–O–L–E
- n is an integer selected from 1, 2, 3, 4, 5, 6 ,7 ,8, 9 and 10;
- L represents a linker
- R ⁇ represents —H, –Me, –Et, 4-nitrophenyl, pentafluorophenyl, –N-hydroxysuccinimidyl, –(3-sulfo-N-hydroxysuccinimidyl), or –(dibenzocyclooctyne-sulfo-N-hydroxysuccinimidyl);
- P1 , P2 and P4 represent protecting groups and C represents–L–E p with E p being a solid support or a protected end group E, wherein E and L have the meanings as defined herein;
- P1– P4 represent protecting groups and LG1 represents a leaving group; A3) performing removal of protecting group P3; A4) treating the product of step A3) with a building block 3 in presence of an activating agent
- P1 , P2 , P5 and P6 represent protecting groups and LG2 represents a leaving group; A5) performing removal of protecting group P6; A6) repeating steps A4) and A5) two times to obtain intermediate compound 4a;
- P1 , P2 , P4 and P5 represent protecting groups and C represents–L–E p with E p being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; A7) optionally repeating steps A2)– A6) in the following order A2) ⁇ A3) ⁇ A2) ⁇ A3) ⁇ A4) ⁇ A5) ⁇ A6) n-1 times to obtain intermediate compound of formula 5a,
- P1 , P2 , P4 and P5 represent protecting groups and C represents–L–Ep with Ep being a solid support or a protected end group E, wherein n, E and L have the meanings as defined herein; A8) performing removal of all protecting groups to obtain an oligosaccharide of general formula (I).
- a further method of the synthesis of an oligosaccharide of general formula (I) comprises the following steps: B1) providing a monosaccharide 1
- P1 , P2 and P4 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; B2) treating monosaccharide 1 with a building block 3 in presence of an activating agent
- P1 , P2 , P5 and P6 represent protecting groups and LG2 represents a leaving group; B3) performing removal of protecting group P6; B4) repeating steps B2) and B3) two times; B5) treating the product of step B4) with building block 2 in presence of an activating agent
- P1 , P2 , P4 and P5 represent protecting groups and C represents–L–E p with E p being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; B7) optionally repeating steps B2)– B6) in the following order B5) ⁇ B6) ⁇ B2) ⁇ B3) ⁇ B4) ⁇ B5) ⁇ B6) n-1 times to obtain intermediate compound of formula 5b
- a further method of the synthesis of an oligosaccharide of general formula (I) comprises the following steps: C1) providing a monosaccharide
- P1 , P2 and P5 represent protecting groups and C represents–L–E p with E p being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; C2) treating monosaccharide 6 with a building block 3 in presence of an activating agent
- P1 , P2 , P5 and P6 represent protecting groups and LG2 represents a leaving group; C3) performing removal of protecting group P6; C4) treating the product of step C3) with building block 2 in presence of an activating agent
- P1– P4 represent protecting groups and LG1 represents a leaving group; C5) performing removal of protecting group P3; C6) repeating steps C4) and C5); C7) repeating steps C2) and C3) to obtain intermediate compound 4d;
- P1 , P2 , P4 and P5 represent protecting groups and C represents–L–E p with E p being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; C8) optionally repeating steps C2)– C7) in the following order C2) ⁇ C3) ⁇ C2) ⁇ C3) ⁇ C4) ⁇ C5) ⁇ C6) ⁇ C7) n-1 times to obtain intermediate compound of formula 5d
- a further method of the synthesis of an oligosaccharide of general formula (I) comprises the following steps: D1) providing a monosaccharide
- P1 , P2 and P5 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; D2) treating monosaccharide 6 with a building block 3 in presence of an activating agent
- P1 , P2 , P5 and P6 represent protecting groups and LG2 represents a leaving group; D3) performing removal of protecting group P6; D4) repeating steps D2) and D3); D5) treating the product of step D4) with building block 2 in presence of an activating agent
- P1– P4 represent protecting groups and LG1 represents a leaving group; performing removal of protecting group P3; repeating steps D5) and D6) to obtain intermediate compound 4c;
- P1 , P2 , P4 and P5 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; D8) optionally repeating steps D2)–D7) in the following order D2) ⁇ D3) ⁇ D4) ⁇ D4) ⁇ D5) ⁇ D6) ⁇ D7) n-1 times to obtain intermediate compound of formula 5c,
- P1 , P2 , P4 and P5 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein n, E and L have the meanings as defined herein; D9) performing removal of all protecting groups to obtain an oligosaccharide of general formula (I).
- Another method of the synthesis of an oligosaccharide of general formula (I) comprises the following steps: E1) providing a monosaccharide
- P1 , P2 and P5 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; E2) treating monosaccharide 6 with a building block 2 in presence of an activating agent
- P1– P4 represent protecting groups and LG1 represents a leaving group; E3) performing removal of protecting group P3; E4) repeating steps E2) and E3); E5) treating the product of step E4) with building block 3 in presence of an activating agent
- P1 , P2 , P5 and P6 represent protecting groups and LG2 represents a leaving group; E6) performing removal of protecting group P6; E7) repeating steps E5) and E6) to obtain intermediate compound 4e;
- P1 , P2 , P4 and P5 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; E8) optionally repeating steps E2)– E6) in the following order E5) ⁇ E6) ⁇ E2) ⁇ E3) ⁇ E4) ⁇ E5) ⁇ E6) n-1 times to obtain intermediate compound of formula 5e,
- P1 , P2 , P4 and P5 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein n, E and L have the meanings as defined herein; E8) performing removal of all protecting groups to obtain a oligosaccharide of general formula (I).
- Another method of the synthesis of an oligosaccharide of general formula (I) comprises the following steps: F1) providing a monosaccharide 7
- P7 , P8 and P9 represent protecting groups and C represents–L–E p with E p being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; F2) treating monosaccharide 7 with a building block 8 in presence of an activating agent
- P7– P10 represent protecting groups and LG3 represents a leaving group; F3) performing removal of protecting group P10; F4) treating the product of step F3) with building block 9 in presence of an activating agent
- P7 , P8, P11 and P12 represent protecting groups and LG4 represents a leaving group; F5) performing removal of protecting group P11 to obtain intermediate compound 4f;
- P7– P9 and P12 represent protecting groups and C represents–L–Ep with Ep being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; F6) optionally repeating steps F2)– F5) in the following order F2) ⁇ F3) ⁇ F2) ⁇ F4) ⁇ F5) n-1 times to obtain intermediate compound of formula 5f,
- P7– P9 and P12 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein n, E and L have the meanings as defined herein; F7) performing removal of all protecting groups to obtain an oligosaccharide of general formula (I).
- Another method of the synthesis of an oligosaccharide of general formula (I) comprises the following steps: G1) providing a monosaccharide 7
- P7 , P8 and P9 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; G2) treating monosaccharide 7 with building block 9 in presence of an activating agent
- P7 , P8, P11 and P12 represent protecting groups and LG4 represents a leaving group; G3) performing removal of protecting group P11; G4) treating the product of step G3) with building block 8 in presence of an activating agent
- P7– P9 and P12 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein n, E and L have the meanings as defined herein; G7) performing removal of all protecting groups to obtain an oligosaccharide of general formula (I).
- Another method of the synthesis of an oligosaccharide of general formula (I) comprises the following steps: H1) providing a monosaccharide 10
- P7 , P8 and P12 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; H2) treating monosaccharide 10 with building block 8 in presence of an activating agent
- P7– P10 represent protecting groups and LG3 represents a leaving group; H3) performing removal of protecting group P10; H4) repeating steps H2) and H3) to obtain intermediate compound 4h;
- P7– P9 and P12 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; H5) optionally treating compound 4h with building block 9 in presence of an activating agent
- a further method of the synthesis of an oligosaccharide of general formula (I) comprises the following steps: I1) providing a monosaccharide 1 (1), wherein P1 , P2 and P4 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; I2) treating monosaccharide 1 with building block 2 in presence of an activating agent
- P1– P4 represent protecting groups and LG1 represents a leaving group; I3) performing removal of protecting group P3; I4) treating the product of step I3) with building block 3 in presence of an activating agent
- a further method of the synthesis of an oligosaccharide of general formula (I) comprises the following steps: J1) providing a monosaccharide 1
- P1 , P2 and P4 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; J2) treating monosaccharide 1 with a building block 3 in presence of an activating agent
- P1 , P2 , P5 and P6 represent protecting groups and LG2 represents a leaving group; J3) performing removal of protecting group P6 J4) treating the product of step J3) with building block 2 in presence of an activating agent
- P1 , P2 , P4 and P5 represent protecting groups and C represents–L–Ep with Ep being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; J6) optionally repeating steps J2)– J5) in the following order J4) ⁇ J5) ⁇ J2) ⁇ J3) ⁇ J4) ⁇ J5) n-1 times to obtain intermediate compound of formula 5j
- a further method of the synthesis of an oligosaccharide of general formula (I) comprises the following steps: K1) providing a monosaccharide
- P1 , P2 and P5 represent protecting groups and C represents–L–E p with E p being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; K2) treating monosaccharide 6 with building block 2 in presence of an activating agent
- P1– P4 represent protecting groups and LG1 represents a leaving group; K3) performing removal of protecting group P3; K4) repeating steps K2) and K3) to obtain intermediate compound 4k;
- P1 , P2 , P4 and P5 represent protecting groups and C represents–L–E p with E p being a solid support or a protected end group E, wherein E and L have the meanings as defined herein; K5) optionally treating compound 4k with a building block 3 in presence of an activating agent
- P1 , P2 , P4 and P5 represent protecting groups and C represents–L–E p with Ep being a solid support or a protected end group E, wherein n, E and L have the meanings as defined herein; K7) performing removal of all protecting groups to obtain an oligosaccharide of general formula (I).
- E p represents a solid support or a protected end group.
- the term“protecting group” as used herein refers to commonly used groups in organic synthesis, preferably used for protection hydroxyl groups, and thiols.
- P1 , P2 , P3, P4 , P5, P6, P7 , P8, P9, P10, P11 and P12 are suitable protecting groups for hydroxyl groups, more preferably different suitable protecting groups for hydroxyl groups capable of being removed subsequently one after another by a suitable sequence of deprotection reactions
- Preferred protecting groups for hydroxyl groups are acetyl, phenyl, benzyl, isopropylidene, benzylidene, benzoyl, p-methoxybenzyl, p-methoxybenzylidene, p-methoxyphenyl, p-bromobenzyledene, p-nitrophenyl, allyl, acetyl, isopropyl, p-bromobenzyl, dimethoxytrityl, trityl, 2-naphthylmethyl, pivaloyl, (2-nitrophenyl)acetyl, triisopropyls
- the protecting groups can be differentiated in permanent protecting groups and temporary protecting groups.
- Permanent protecting groups are protecting groups that are stable during the entire synthesis and that can be efficiently removed at the late stage of the synthesis.
- permanent protecting groups include P1 , P2 , P4 P5, P7 , P8, P9, P12 , P13 and P14.
- P1 , P2 , P4 P5, P7 , P8, P9 and P12 are masking the hydroxyl groups during the entire synthesis, while protecting groups P13 and P14 are masking the terminal amino group present in the end group E p .
- protecting groups P1 , P2 , P5, P7 , P8 and P9 are benzyl groups
- protecting group P4 is a benzoyl group
- protecting group P12 is a benzyl group
- protecting group P13 is a benzyl group
- protecting group P14 is a benzyloxycarbonyl group (Cbz).
- the temporary protecting groups are generally orthogonal protecting groups that can be selectively removed at different levels of the synthesis to free hydroxyl groups for subsequent introduction of different substituents, including monooligosaccharides, other protecting groups or other residues present on the molecule.
- temporary protecting groups include P3, P6, P10 and P11.
- the choice of leaving groups affects the stereochemical outcome of the glycosylation reactions in steps A2), A4), B2), B5), C2), C4), D2), D5), E2), E5), F2), F4), H2), H5), J2), J4), I2), I4), K2) and K5).
- Temporary protecting groups P3, P6, P10 and P11 are preferably selected from, but are not restricted to: allyl, p-methoxybenzyl, 2-naphthylmethyl, tri-isopropylsilyl, tert- butyldimethylsilyl, tert-butylmethoxyphenylsilyl, triethylsilyl, trimethylsilyl, 2-trimethylsilylethoxymethyl, 9-fluorenylmethoxycarbonyl and levulinoyl.
- protecting groups P3, P6, P10 and P11 can be selectively removed in presence of protecting groups P1 , P2 , P4 P5, P7 , P8, P9, P12 , P13 and P14.
- P3, P6, P10 and P11 are 9-fluorenylmethoxycarbonyl or levulinoyl, and more preferably P3 and P11 are the same and P6 and P10 are the same.
- protecting groups P6 and P10 represent 9-fluorenylmethoxycarbonyl and protecting groups P3 and P11 represent -fluorenylmethoxycarbonyl or levulinoyl.
- Building blocks 2, 3, 8 and 9 are glycosylating agents.
- glycosylating agent refers to a monosaccharide functionalized at the anomeric position with a leaving group that upon activation with a suitable activating agent provide an oxocarbenium intermediate able to react with a nucleophile, such as a hydroxyl group.
- a suitable activating agent provides an oxocarbenium intermediate able to react with a nucleophile, such as a hydroxyl group.
- glycosylating agents 2, 3, 8 and 9 are functionalized at the anomeric position with leaving groups LG1 , LG2 , LG3 and LG4.
- leaving groups suitable for the present synthesis are well known to the person skilled in carbohydrate chemistry and include halides, thioethers, imidates, acetate, sulfoxide, pentenyl, and phosphate.
- leaving groups LG1 , LG2 , LG3 and LG4 are selected from the group of leaving groups consisting of:
- an oxocarbenium intermediate relies on the activation of the leaving group installed at the anomeric position of the glycosylating agent with an appropriate or suitable activating agent.
- suitable activating agents for phosphate i.e. phosphate activating agents
- imidate i.e. imidate activating agents
- suitable activating agents for thioether include, but are not restricted to: NIS/TfOH, NIS/TMSOTf, NIS/BF .
- silyl triflate examples include, but are not restricted to trimethylsilyl trifluoromethanesulfonate, tert-butyl dimethyl trifluoromethanesulfonate, triiospropyl trifluoromethanesulfonate.
- LG1 , LG2 , LG3 and LG4 are thioethers and even more preferred is when LG1 , LG2 , LG3 and LG4 are selected from the group consisting of: , , .
- the coupling reaction between oligosaccharides in the steps A2), A4), B2), B5), C2), C4), D2), D5), E2), E5), F2), F4), G2), G4), H2), H5), J2), J4), I2), I4), K2) and K5) is performed by activation with NIS/TfOH or TMSOTf, in a mixture of apolar solvent and polar aprotic solvent at a temperature of between -78°C or -50°C to 0°C or between–10°C and +10°C.
- polar aprotic solvents are tetrahydrofuran, diethyl ether and dioxane.
- Preferred apolar solvents are toluene, halogenated solvents such as chloroform and methylene chloride.
- Preferred mixtures of apolar and polar aprotic solvent are: methylene chloride / tetrahydrofuran, methylene chloride / diethyl ether, toluene / diethyl ether, toluene/ tetrahydrofuran.
- the base is NaOMe or LiOH;
- a further aspect according to the present invention refers to an intermediate compound for preparing a oligosaccharide of the general formulae (I), (II), (II-a), (II-b), (II-c), (II-d), (II-e), (II-f), (II-g), (II-h), (II-i), (II-j), (II-k), (III), (III-a), (III-b), (III-c), (III-d), (III-e), (III-f), (III-g), (III-h), (III-i), (III-j) or (III-k) , wherein the intermediate compound has any one of general formulae (I2a), (I2b), (I2c), (I2d), (I2e), (I2f), (I2g), (I2h), (I2h), (III-i), (III-j) or (III-k) , wherein the intermediate compound has any one of general formulae (I
- C represents–L–E p with Ep being a solid support or a protected end group E
- P1 , P2 , P3, P4 , P5, P6, P7 , P8, P9, P10, P11 and P12 represent protecting groups
- E and L have the same meanings as defined above.
- –Ld— represents –(CH 2 ) q –,–(CH(OH)) q –, –(CF 2 ) q –, –(CH 2 –CH 2 –O) q –C 2 H 4 –, or –(CH 2 –CH 2 –O) q –CH 2 –;
- –Le– represents –(CH 2 ) p1 –, –(CF 2 ) p1 –, –C 2 H 4 –(O–CH 2 –CH 2 ) p1 –, –CH 2 –(O–CH 2 –CH 2 ) p1 – or –(CH 2 ) p1 –O–(CH 2 ) p2 –; and
- An especially preferred intermediate is an intermediate of formula (I2a), (I2b), (I2c), (I2d), (I2e), (I2f), (I2g), (I2h), (I3a), (I3b), (I3c), (I3d), (I3e), (I3f), (I3g), (I3h), (I3i), (I3j), (I3k), (I3l), (I3m), (I3n), (I4a), (I4b), (I4c), (I4d), (I4e), (I4f), (I4g), (I4h), (I4i), (I4j), (I5a), (I5b), (I5c), (I5d), (I5e), (I5f), (I5g), (I5h), (I5i), (I4j), (I5a), (I5b), (I5c), (I5d), (I5e), (I5f), (I5g),
- P1 , P2 , P3, P4 , P5, P6, P7 , P8, P9, P10, P11 and P12 are suitable protecting groups for hydroxyl groups, more preferably different suitable protecting groups for hydroxyl groups capable of being removed subsequently one after another by a suitable sequence of deprotection reactions.
- Preferred protecting groups for hydroxyl groups are acetyl, phenyl, benzyl, isopropylidene, benzylidene, benzoyl, p-methoxybenzyl, p-methoxybenzylidene, p-methoxyphenyl, p-bromobenzyledene, p-nitrophenyl, allyl, acetyl, isopropyl, p-bromobenzyl, dimethoxytrityl, trityl, 2-naphthylmethyl, pivaloyl, (2- nitrophenyl)acetyl, triisopropylsilyl, tert-butyldimethylsilyl, tert-butyldiphenylsilyl, tert-butylmethoxyphenylsilyl, triethylsilyl, trimethylsilyl, 2-trimethylsilylethoxymethyl, 9-fluoren
- intermediates (I2a), (I2b), (I2c), (I2d), (I2e), (I2f), (I2g), (I2h), (I3a), (I3b), (I3c), (I3d), (I3e), (I3f), (I3g), (I3h), (I3i), (I3j), (I3k), (I3l), (I3m), (I3n), (I4a), (I4b), (I4c), (I4d), (I4e), (I4f), (I4g), (I4h), (I4i), (I4j), (I5a), (I5b), (I5c), (I5d), (I5e), (I5f), (I5g), (I5h), (I5i) or (I5j), are especially preferred when protecting groups P1 , P2 , P5, P7 , P8 and P9 are benzyl groups, protecting group, P3, P6, P9
- Glycoconjugates Another aspect of the present invention refers to a conjugate comprising an oligosaccharide of general formula (I) covalently bound or covalently linked to an immunogenic carrier through the terminal group E of the–O–L–E group.
- another aspect of the present invention is directed to an oligosaccharide of any of the general formulae (I), (II), (II-a)–(II-k), (III), (III-a)–(III-j) or (III-k) conjugated with an immunogenic carrier through the terminal group E of the–O–L–E group.
- a conjugate comprising a synthetic oligosaccharide of the general formula (I), (II), (II-a)–(II-k), (III), (III-a)–(III-j) or (III-k), covalently bound or covalently linked to an immunogenic carrier through the terminal group E of the–O–L–E group is also defined as a conjugate obtained by reacting an oligosaccharide of any of the general formulae (I), (II), (II-a)–(II- k), (III), (III-a)–(III-j) or (III-k) with an immunogenic carrier.
- TI-2 antigens are antigens, which are recognized only by mature B cells through the cross linking of surface exposed immunoglobulin receptors. Without T cell help, no immunological memory is generated and neither isotype switching from IgM to other IgG subclasses, nor B cells affinity maturation occurs.
- oligosaccharides are known poor immunogens in humans due to the structural homology to human glycolipids and glycoproteins.
- oligosaccharides Due to their poor immunogenic properties, oligosaccharides manifest poor ability to produce both antibody production by B cells, as well as the formation of memory cells, features which are essential for the production of potent vaccines. Therefore, to produce a potent oligosaccharide-based vaccine, the oligosaccharides of general formulae (I), (II), (II-a)–(II-k), (III), (III-a)–(III-j) or (III-k) are conjugated to an immunogenic carrier to provide conjugates, which present increased immunogenicity in comparison with the oligosaccharide.
- a conjugate comprising a oligosaccharide fragment T*–[(–U x+4 –U x+3 –U x+2 –U x+1 –U x ) m –(V x+2 –V x+1 –V x ) 1-m ] n –T–O– wherein m, n, x, U x+1 , U x+2 , U x+3 , U x+4 , V x , V x+1 , V x+2 , T and T* have the meanings defined herein, covalently linked through the O atom to an immunogenic carrier.
- Said conjugate comprises at least one synthetic oligosaccharide of the general formula (I) and an immunogenic carrier to which the at least one oligosaccharide (I) is covalently bound.
- Said antibodies are cross-reacting with the natural Klebsiella pneumoniae serotype O3, O3b and/or O5 lipopolyoligosaccharides and present opsonophagocytosis and bactericidal activity, thus conferring protection against Klebsiella pneumoniae serotype O3, O3b and/or O5 bacteria.
- immunogenic carrier is defined as a structure, which is conjugated to the oligosaccharide to form a conjugate that presents an increased of the oligosaccharides of the general formulae (I), (II), (II-a)–(II-k), (III), (III-a)–(III-j) or (III-k) to the immunogenic carrier has as effect the stimulation of the immune response against the oligosaccharide of general formula (I) without inducing an immune response against said immunogenic carrier.
- Preferred immunogenic carriers are carrier proteins or glycosphingolipids with immunomodulatory properties.
- a carrier protein is a protein selected from the group comprising or consisting of: a diphtheria toxoid, a mutated diphtheria toxoid, a modified diphtheria toxoid, a mutated and modified diphtheria toxoid, a tetanus toxoid, a modified tetanus toxoid, a mutated tetanus toxoid, non-lipidated cell-surface liporotein (protein D) of non-typeable Haemophilus influenzae, outer membrane protein (OMP) complex of Neisseria meningitidis, bovine serum albumin (BSA), keyhole limpet hemocyanine (KLH), recombinant non-toxic form of Pseudomonas aeruginosa exotoxin A (rEPA) or cholera toxoid (CT).
- a diphtheria toxoid a
- toxoid refers to a bacterial toxin (usually an exotoxin), whose toxicity has been inactivated or suppressed either by chemical (formalin) or heat treatment, while other properties, typically immunogenicity, are maintained.
- a mutated toxoid as used herein is a recombinant bacterial toxin, which has been amended to be less toxic or even non-toxic by amending the wild-type amino acid sequence. Such a mutation could be a substitution of one or more amino acids.
- Such a mutated toxoid presents on its surface a functionality that can react with the functional group Y of the interconnecting molecule to provide a modified toxoid.
- Said functionality is known to the person skilled in the art and includes, but is not restricted to the primary amino functionality of a lysine residue that can react with activated esters, an isocyanate group or an aldehyde in presence of a reducing agent, to the carboxylate functionality of a glutamate or aspartate residue that can be activated by carbodiimides or to the thiol functionality of a cysteine residue.
- Activated esters include N-( ⁇ -maleimidobutyryloxy) sulfosuccinimide ester (sulfo- GMBS), succinimidyl (4-iodoacetyl) aminobenzoate (sulfo-SIAB), succinimidyl-3- (bromoacetamido)propionate (SBAP), disuccinimidyl glutarate (DSG), disuccinimidyl adipate (DSA), 2-pyridyldithiol-tetraoxatetradecane-N-hydroxysuccinimide (PEG-4- SPDP) (see Figure 2).
- the cysteine residue on the carrier protein can be converted to the corresponding dehydroalanine that can be further reacted with a suitable interconnecting molecule to provide modified carrier protein having on their surface the functional group X of the interconnecting molecule.
- the oligosaccharides of general formula I are conjugated to the non-toxic mutated diphtheria toxin CRM 197 presenting as a functionality a primary amine functionality of a lysine residue.
- CRM 197 like wild-type diphtheria toxin is a single polypeptide chain of 535 amino acids (58 kD) consisting of two subunits linked by disulfide bridges having a single amino acid substitution of glutamic acid for glycine.
- the carrier protein presents on its surface primary amino functionalities of lysine residues that are able to react with the functional group Y of the interconnecting molecule to provide modified carrier protein having on their surface said functional group X of the interconnecting molecule, which is able to react with the terminal amino group of the linker of the compounds of general formula (I).
- Said functional group X of the interconnecting molecules is selected of the group comprising or consisting of maleimide; ⁇ -iodoacetyl; ⁇ -bromoacetyl; and N-hydroxy- succinimide ester (NHS), aldehyde, imidoester, carboxylic acid, alkyl sulfonate, sulfonyl chloride, epoxide, anhydride, carbonate (see Figure 3).
- the oligosaccharide of general formula I is conjugated to the non-toxic mutated diphtheria toxin CRM 197 , which is modified by maleimide.
- the oligosaccharide of general formula I is conjugated to the non-toxic mutated diphtheria toxin CRM 197 , which is modified by ⁇ -bromoacetamide. In the most preferred embodiment, the oligosaccharide of general formula I is conjugated to the non-toxic mutated diphtheria toxin CRM 197 , which is modified by N- hydroxysuccinimide adipate.
- c is comprised between 2 and 18;
- a represents an integer selected from 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10,
- b represents an integer selected from 1, 2, 3 and 4,
- CP is a carrier protein
- CP is CRM197.
- the conjugate is of general formula (IV), wherein CP is CRM 197 and c,–E 1 –, W, m, n, x, L, Ux+1, Ux+2, Ux+3, Ux+4, Vx, Vx+1, Vx+2, T and T* have the meanings as defined herein.
- the linker–L– is selected from: –La–, –La–Le–, –La–Lb–Le–, and –La–Ld–Le–;
- –La– is selected from: –(CH2)o–, –(CH2–CH2–O)o–C2H4–,–(CH2–CH2–O)o–CH2; –Lb– represents –O–, –NH–CO–NH–, –NH–CO–CH2–NH–, –NH–CO–;
- –Ld— is selected from:–(CH2)q–, –(CF2)q–, –(CH2–CH2–O)q–C2H4–, and –(CH2–CH2–O)q–CH2–;
- —Le— is selected from: –(CH2)p1–, –(CF2)p1–, –C2H4–(O–CH2–CH2)p1–, –CH2–(O–CH2–CH2)p1– and –(CH2)p1–O–(CH2)p2–;
- the linker–L– is selected from: –La–, –La–Le–, –La–Lb–Le–, and –La–Ld–Le–; –La— is selected from: –(CH 2 ) o –, –(CH 2 –CH 2 –O) o –C 2 H 4 –,–(CH 2 –CH 2 –O) o –CH 2 ; –Lb– represents –O–, –NH–CO–NH–, –NH–CO–CH 2 –NH–, –NH–CO—;
- –Ld— is selected from:–(CH 2 ) q –, –(CF 2 ) q –, –(CH 2 –CH 2 –O) q –C 2 H 4 –, and –(CH 2 –CH 2 –O) q –CH 2 –;
- –Le— is selected from: –(CH 2 ) p1 –, –(CF 2 ) p1 –, –C 2 H 4 –(O–CH 2 –CH 2 ) p1 –, –CH 2 –(O–CH 2 –CH 2 ) p1 – and –(CH 2 ) p1 –O–(CH 2 ) p2 –;
- o, q, p1 and p2 are independently of each other an integer selected from 1, 2, 3, 4, 5, and 6; preferably an integer selected from 1, 2, 3, and 4; , and a is an integer selected from 2, 3, 4, 5 –W– represents
- x 1,
- V*– represents H.
- the linker–L– is selected from: –La–, –La–Le–, –La–Lb–Le–, and –La–Ld–Le–; –La— is selected from: –(CH 2 ) o –, –(CH 2 –CH 2 –O) o –C 2 H 4 –,–(CH 2 –CH 2 –O) o –CH 2 ; –Lb– represents –O–, –NH–CO–NH–, –NH–CO–CH 2 –NH–, –NH–CO—;
- –Ld— is selected from:–(CH 2 ) q –, –(CF 2 ) q –, –(CH 2 –CH 2 –O) q –C 2 H 4 –, and –(CH 2 –CH 2 –O) q –CH 2 –;
- –Le— is selected from: –(CH 2 ) p1 –, –(CF 2 ) p1 –, –C 2 H 4 –(O–CH 2 –CH 2 ) p1 –, –CH 2 –(O–CH 2 –CH 2 ) p1 – and –(CH 2 ) p1 –O–(CH 2 ) p2 –;
- o, q, p1 and p2 are independently of each other an integer selected from 1, 2, 3, 4, 5, and 6; preferably an integer selected from 1, 2, 3, and 4; , and a is an integer selected from 2, 3, 4, 5 –W– represents
- o is an integer selected from 2, 3, 4, 5 and 6; , and a is an integer selected from 2, 3, 4, 5 –W– represents
- V*– represents H.
- linker–L represents—(CH 2 ) o – ,
- o is an integer selected from 2, 3, 4, 5 and 6; , and a is an integer selected from 2, 3, 4, 5 –W– represents
- c is comprised between 2 and 18, more preferably between 5 and 15, even more preferably between 8 and 12. It is also preferred that n represents 1.
- V conjugate of general formula (V) [H–((–U x+4 –U x+3 –U x+2 –U x+1 –U x ) m –(V x+2 –V x+1 –V x ) 1-m ) n –O–L–E 1 –W] c –CRM 197 (V) wherein
- c is comprised between 2 and 18;
- –E 1 – represents a covalent bond, —NH–, –O–NH–, –O–, –S–, –CO—,
- a represents an integer selected from 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10,
- b represents an integer selected from 1, 2, 3 and 4;
- said immunogenic carrier is preferably a glycosphingolipid with immunomodulatory properties, and more preferably (2S,3S,4R)-1-( ⁇ -D- galactopyranosyl)-2-hexacosanoylaminooctadecane-3,4-diol.
- glyco- sphingolipid with immunomodulatory properties refers to a suitable glycosphingolipid capable of stimulating the immune system's response to a target antigen, but which does not in itself confer immunity as defined above.
- Glycosphingolipids as used herein are compounds containing a carbohydrate moiety ⁇ –linked to a sphingolipid.
- the carbohydrate moiety is a hexopyranose and most preferably is ⁇ -D-galactopyranose.
- sphingolipids are a class of lipids containing a C18 amino alcohol connected via an amide bond to a fatty acid.
- the C18 amino alcohol is preferably mono-, di- or polysubstituted with hydroxyl groups. Especially preferred, the C18 amino alcohol is phytosphingosine.
- the fatty acid is preferably a monocarboxylic acid having a saturated alkyl chain of a number of carbons ranging from 16 to 28 and more preferably from 18 to 26.
- Glycosphingolipids with immunomodulatory properties include, but they are not restricted to (2S,3S,4R)-1-( ⁇ -D-galactopyranosyl)-2- hexacosanoylaminooctadecane-3,4-diol, which can stimulate natural killer (NK) activity and cytokine production by natural killer T (NKT) cells and exhibits potent antitumor activity in vivo (Proc. Natl Acad. Sci. USA, 1998, 95, 5690).
- the conjugates of the oligosaccharides of general formula I with a glycosphingolipid with immunomodulatory properties have the advantage of being heat stable.
- a functionality is introduced on the glycosphingolipid with immunomodulatory properties.
- Said functionality is prone to react directly with the terminal amino group of the linker of the oligosaccharides of general formula I to provide conjugates of the oligosaccharides of general formula I, or with the functional group Y of the interconnecting molecule to provide the modified glycosphingolipid with immunomodulatory properties.
- said functionality is introduced at the C6 of the carbohydrate moiety of the glycosphingolipid with immunomodulatory properties.
- the glycosphingolipid with immunomodulatory properties is functionalized with a functionality, which is prone of reacting with the terminal amino group of the oligosaccharides or with the functional group Y of the interconnecting molecule.
- a functionality prone to react with an amino group includes, but it is not restricted to activated ester, isocyanate group, aldehyde, epoxide, imidoester, carboxylic acid, alkyl sulfonate and sulfonyl chloride.
- the modified glycosphingolipid with immunomodulatory properties presenting the functional group X of the interconnecting molecule includes, but it is not restricted to amine, alcohol, thiol, activated ester, isocyanate group, aldehyde, epoxide, vinyl, imidoester, carboxylic acid, alkyl sulfonate, sulfonyl chloride, vinyl group, alkynyl group and azido group.
- the functionality introduced at the C6 of the carbohydrate moiety of the glycosphingolipid with immunomodulatory properties is selected from the group comprising or containing an amine, a thiol, an alcohol, a carboxylic acid, a vinyl, maleimide, ⁇ -iodoacetyl, ⁇ -bromoacetyl, N-hydroxysuccinimide ester (NHS), 2-pyridyldithiols.
- Said functional group X of the interconnecting molecules is selected of the group comprising or consisting of maleimide, ⁇ -iodoacetyl, ⁇ -bromoacetyl, N-hydroxy- succinimide ester (NHS), aldehyde, carboxylic acid, epoxide, alkyl sulfonate, sulfonyl chloride, anhydride, carbonate.
- interconnecting molecule refers to a bifunctional molecule containing functional group X and functional group Y, wherein functional group X is capable of reacting with the terminal amino group on the linker–L– and the functional group Y is capable of reacting with a functionality present on the immunogenic carrier or on the solid support.
- Vaccines containing at least one conjugate of the present invention cause fewer side effects and/or non-protective immune responses in comparison to vaccines containing isolated (and not synthesized) mixtures of oligosaccharides obtained by non-selective cleavage of the capsular poly-,oligosaccharide of Klebsiella pneumoniae or conjugates thereof.
- inventive vaccines can be easier manufactured in accordance with the GMP regulations than the vaccines containing isolated mixtures of non- selectively cleaved capsular poly-,oligosaccharides and are easier characterized, which makes stability and purity control easier as well as detection of kind and amount of impurities. More preferred is a conjugate of any one of the formulae (V-1)– (V-11):
- L, E 1 , W, c, and n have the same meanings as defined above. More preferred is a conjugate of any one of the formulae (IV), (V) and (V-1)– (V-11), wherein n is an integer from 2 to 10.
- a conjugate of general formula (IV), (V) and (V-1)– (V-11), wherein–W— represents and a is an integer selected from 2, 3, 4, 5 and 6 is especially preferred.
- the linker–L– represents –La–, –La–Le–, –La–Lb–Le–, or –La–Ld–Le–;
- –La– represents –(CH 2 ) o –, –(CH 2 –CH 2 –O) o –C 2 H 4 –, or–(CH 2 –CH 2 –O) o –CH 2 ;
- –Lb— represents –O–, –NH–CO—NH–, –NH–CO–CH 2 –NH–, –NH–CO—;
- –Ld— represents –(CH 2 ) q –,–(CH(OH)) q –, –(CF 2 ) q –, –(CH 2 –CH 2 –O) q –C 2 H 4 –, or –(CH 2 –CH 2 –O) q –CH 2 –;
- –Le– represents –(CH 2 ) p1 –, –(CF 2 ) p1 –, –C 2 H 4 –(O–CH 2 –CH 2 ) p1 –, –CH 2 –(O–CH 2 –CH 2 ) p1 – or –(CH 2 ) p1 –O–(CH 2 ) p2 –; and
- a conjugate comprising a oligosaccharide of any one of general formulae (I), (II), (II-a)–(II-k), (III), (III-a)–(III-j) or (III-k), and particularly a conjugate of any one of general formulae (IV), (V) and (V-1)– (V-11), elicits a protective immune response in a human and/or animal host, and therefore is useful for prevention and/or treatment of diseases associated with Klebsiella pneumoniae serotype O3, O3b and/or O5 bacteria.
- the conjugates comprising the oligosaccharides of general formula (I) conjugated to an immunogenic carrier are useful for prevention and/or treatment of diseases associated with Klebsiella pneumoniae bacteria containing in their lipopolysaccharide one of the following oligosaccharide fragments: -2)- ⁇ -D-Man-(1, 2)- ⁇ -D-Man-(1, 2)- ⁇ -D-Man-(1, 3)- ⁇ -D-Man-(1, 3)- ⁇ -D-Man-(1-;
- the bacterium containing in the lipopolysaccharide one of the above mentioned oligosaccharide fragments is Klebsiella pneumoniae serotype O3, O3b and/or O5.
- the conjugates comprising the oligosaccharides of general formula I conjugated to an immunogenic carrier are useful for prevention and/or treatment of diseases associated with bacteria, and particularly with diseases associated with bacteria containing in their O-polysaccharide one of the following oligosaccharide fragments: -2)- ⁇ -D-Man-(1, 2)- ⁇ -D-Man-(1, 2)- ⁇ -D-Man-(1, 3)- ⁇ -D- Man-(1, 3)- ⁇ -D-Man-(1-; -3)- ⁇ -D-Man-(1, 2)- ⁇ -D-Man-(1, 2)- ⁇ -D-Man-(1, 2)- ⁇ -D-Man- (1 3) M (1 3) M (1 3) M (1 3) M (1 3) M (1 3) M (1 2) M (1 2) M (1 2)- ⁇ -D-Man-(1-; -2)- ⁇ -D-Man-(1, 3)- ⁇ -D-Man-(1, 3)- ⁇ -D-Man-(1, 2)- ⁇ -D-Man-(1,
- Another aspect of the present invention is directed to a pharmaceutical composition or a vaccine comprising at least one conjugate that comprises an oligosaccharide of general formula (I) conjugated to an immunogenic carrier and/or at least one oligosaccharide of general formula (I) together with at least one pharmaceutically acceptable adjuvant and/or excipient.
- Said pharmaceutical composition can be used for raising a protective immune response in a human and/or animal host.
- the pharmaceutical composition is suitable for use in humans.
- said pharmaceutical composition or vaccine further comprises at least one of capsular polysaccharides, O- polysaccharides and/or capsular polysaccharides, O-polysaccharide fragments and/or protein conjugates thereof of Klebsiella pneumoniae bacteria selected from the group comprising or consisting of Klebsiella pneumoniae serotypes O1, O2 (O2a, O2ac,...), O4, O7, O8, O12 and carbapenem-resistant Klebsiella pneumoniae ST258 Galactan-III.
- the term“adjuvant” as used herein refers to an immunological adjuvant i.e.
- immunological adjuvants include, but are not restricted to oil emulsions (e.g. Freund's adjuvant), saponins, aluminum or calcium salts (e.g. alum), non-ionic block polymer surfactants, and many others.
- compositions are preferably in aqueous form, particularly at the point of administration, but they can also be presented in non-aqueous liquid forms or in dried forms e g as gelatin capsules or as lyophilisates etc
- Pharmaceutical compositions may include one or more preservatives, such as thiomersal or 2-phenoxyethanol.
- Mercury-free compositions are preferred, and preservative-free vaccines can be prepared.
- Pharmaceutical compositions may include a physiological salt, such as a sodium salt e.g. to control tonicity.
- Sodium chloride (NaCl) is typical and may be present at between 1 and 20 mg/ml.
- compositions can have an osmolality of between 200 mOsm/kg and 400 mOsm/kg.
- Pharmaceutical compositions may include compounds (with or without an insoluble metal salt) in plain water (e.g. w.f.i.), but will usually include one or more buffers.
- Typical buffers include: a phosphate buffer; a Tris buffer; a borate buffer; a succinate buffer; a histidine buffer (particularly with an aluminium hydroxide adjuvant); or a citrate buffer. Buffer salts will typically be included in the 5-20 mM range.
- compositions typically have a pH between 5.0 and 9.5 e.g. between 6.0 and 8.0. Pharmaceutical compositions are preferably sterile and gluten free. Pharmaceutical compositions are suitable for administration to animal (and, in particular, human) patients, and thus include both human and veterinary uses. They may be used in a method of raising an immune response in a patient, comprising the step of administering the composition to the patient.
- the pharmaceutical compositions of the present invention may be administered before a subject is exposed to a Klebsiella pneumoniae serotype O3, O3b and/or O5 and/or after a subject is exposed to a Klebsiella pneumoniae serotype O3, O3b and/or O5.
- the present invention is directed to the use of at least one conjugate that comprises at least one oligosaccharide of general formula (I) conjugated to an immunogenic carrier and/or at least one oligosaccharide vaccine for prevention and/or treatment of diseases associated with Klebsiella pneumoniae serotype O3, O3b or O5 bacteria, particularly, diseases associated with Klebsiella pneumoniae serotype O3, O3b or O5 bacteria is selected from the group comprising or consisting of pneumonia, bronchitis, meningitis, urinary tract infection, wound infection, osteomyelitis, bacteremia, septicemia and ankylosing spondylitis.
- diseases associated with Klebsiella pneumoniae serotype O3, O3b or O5 bacteria is selected from the group comprising or consisting of pneumonia, bronchitis, meningitis, urinary tract infection, wound infection, osteomyelitis, bacteremia, septicemia and ankylosing spondylitis.
- the present invention refers to the use of at least one oligosaccharide of any one of general formulae (I), (II), (II-a)–(II-k), (III), (III-a)–(III-j) or (III-k) and/or at least one of the conjugates comprising at least one oligosaccharide of any one of general formulae (I), (II), (II-a)–(II-k), (III), (III-a)–(III-j) or (III-k) for the manufacture of said pharmaceutical composition or said vaccine.
- the present invention refers to the use of at least one of the oligosaccharides I'a-1– I'a-11, I'a-1– I'b-11, I'b-1– I'c-11, I'c-1– I'c-11, I'd-1– I'd- 11, I'e-1– I'e-11 and I'f-1– I'f-11 and/or at least one of the conjugates comprising at least one of the oligosaccharides I'a-1– I'a-11, I'a-1– I'b-11, I'b-1– I'c-11, I'c-1– I'c-11, I'd-1– I'd-11, I'e-1– I'e-11 and I'f-1– I'f-11 for the manufacture of said pharmaceutical composition or said vaccine.
- the present invention refers to the use of at least one conjugate of any one of general formulae (IV), (V) and (V-1)– (V-11) for the manufacture of said pharmaceutical composition or said vaccine.
- Pharmaceutical compositions may be prepared in unit dose form.
- the dose of the inventive conjugate is between 0.1 and 10 ⁇ g, preferably 1 and 10 ⁇ g, preferably 0.2 and 9 ⁇ g, more preferably 0.5 and 9 ⁇ g, preferably 1 and 6 ⁇ g, and most preferably 1 and 5 ⁇ g.
- a unit dose may have a volume of between 0.1-1.0 mL e.g. about 0.5 mL.
- the invention also provides a delivery device (e.g.
- compositions of the invention may be prepared in various forms. For example, the compositions may be prepared as injectables, either as liquid solutions or suspensions.
- Solid forms suitable for solution in, or suspension in, liquid vehicles prior to injection can also be prepared (e.g. a lyophilised composition or a spray- freeze dried composition).
- the composition may be prepared for topical administration e.g. as an ointment, cream or powder.
- the composition may be prepared for oral administration e.g. as a tablet or capsule, as a spray, or as a syrup (optionally flavoured).
- the composition may be prepared for pulmonary administration e.g. by an inhaler, using a fine powder or a spray.
- the composition may be prepared as a suppository.
- the composition may be prepared for nasal, aural or ocular administration e.g. as a spray or drops. Injectables for intramuscular administration are typical.
- the pharmaceutical compositions may comprise an effective amount of an adjuvant i.e. an amount which, when administered to an individual, either in a single dose or as part of a series, is effective for enhancing the immune response to a co- administered Klebsiella pneumoniae serotype O3, O3b and/or O5 antigen.
- an adjuvant i.e. an amount which, when administered to an individual, either in a single dose or as part of a series, is effective for enhancing the immune response to a co- administered Klebsiella pneumoniae serotype O3, O3b and/or O5 antigen.
- This amount can vary depending upon the health and physical condition of the individual to be treated, age, the taxonomic group of individual to be treated (e.g. non-human primate, primate, etc.), the capacity of the individual's immune system to synthesize antibodies, the degree of protection desired, the formulation of the vaccine, the treating doctor's assessment of the medical situation, and other relevant factors.
- the amount will fall in a
- a therapeutically effective dosage of one conjugate according to the present invention or of one oligosaccharide of general formula (I) refers to that amount of the compound that results in an at least a partial immunization against a disease. Toxicity and therapeutic efficacy of such compounds can be determined by standard pharmaceutical, pharmacological, and toxicological procedures in cell cultures or therapeutic index. The actual amount of the composition administered will be dependent on the subject being treated, on the subject's weight, the severity of the affliction, the manner of administration and the judgment of the prescribing physician.
- Another aspect of the present invention is directed to a method of inducing immune response against Klebsiella pneumoniae serotype O3, O3b and/or O5 in a human and/or animal host, said method comprising administering of the oligosaccharide of general formula (I) and/or salt thereof and/or a conjugate thereof or pharmaceutical composition thereof to said human and/or animal host.
- a method of treating or preventing diseases caused by Klebsiella pneumoniae serotype O3, O3b and/or O5, in a human and/or animal host according to the present invention comprises administering of at least one oligosaccharide of general formula (I) and/or salt thereof and/or a conjugate thereof or pharmaceutical composition thereof to said human and/or animal host.
- Yet another aspect of the present invention refers to oligosaccharide of general formula (I) for use as marker in immunological assays for detection of antibodies against bacteria containing in their O-poly-,oligosaccharide one of the following oligosaccharide fragments:
- Such assays comprise, for instance, microarray and ELISA useful for detection of antibodies against bacteria containing in their O poly oligosaccharide one of the above mentioned oligosaccharide fragments, such as Klebsiella pneumoniae serotype O3, O3b and/or O5.
- the O-antigens of K. pneumoniae O3, O3b and O5 are shared respectively by E. coli O9, and O8.
- the O5-antigen is shared by Burkholderia ceparcia O2 and E, and Serratia marcescens O28. Therefore, O-poly-,oligosaccharide one of the above mentioned oligosaccharide fragments can be used for detection of antibodies against E. coli O8, and O9. Burkholderia ceparcia O2 and E and Serratia marcescens O28.
- the oligosaccharides of the present invention can be easily conjugated to solid supports for providing immunological assays useful for detection of antibodies against Klebsiella pneumoniae serotype O3, O3b and/or O5.
- solid supports present on their surface a functionality that is prone to react with the amino group of oligosaccharides of general formula (I) or with the functional group Y of the interconnecting molecule to provide modified solid supports, presenting on their surface the functional group X of the interconnecting molecule that can further react with the amino group of oligosaccharides of general formula (I).
- the solid supports are microarray slides, which present on their surface a functionality that is prone to react with the functional group Y of the interconnecting molecule to provide modified microarray slides, presenting of their surface the functional group X of the interconnecting molecule.
- microarray slides examples include, but are not restricted to Corning® epoxide coated slides or Corning® GAPSTM II coated slides.
- the solid supports are microarray slides presenting on their surface a functionality that is prone to react with the amino group of oligosaccharides of general formula (I), and more preferably an N- hydroxysuccinimide (NHS) activated ester.
- Such microarray slides are for example CodeLink® NHS slides.
- Figure 1 shows the chemical structure of the repeating unit of Klebsiella pneumoniae serotype O3, O3b and O5 LPS O-polysaccharide.
- Figure 2 provides examples of functional group X of the interconnecting molecule according to the present invention.
- Figure 3 provides examples of functional group X of the interconnecting molecule according to the present invention.
- Figure 4 (A) shows a CRM 197 conjugate of the present invention; (B) structure of 21*-CRM 197 ; and (C) 69*-CRM 197 .
- Figure 5 shows SDS-PAGE of glycoconjugates (2.5 ⁇ g/well) 21*-CRM 197 and 69*-CRM 197 used in immunization experiments resolved using a 10 % polyacrylamide gel;
- LPS LPS (O5).
- the sera were diluted 1:200 with 1% BSA-PBS.
- Diluted sera 100 ⁇ L was added per well of the microtiter plate which was coated with 1.0 ⁇ g of the corresponding LPS.
- Detection was done using a HRP conjugated goat anti-mouse secondary antibody diluted to 1:10000 and developed using the TMB substrate. Absorbance was measured at 450 nm and the data were plotted using the GraphPad prism software.
- Sera of 69*-CRM 197 formulation were tested against corresponding O-antigen BSA conjugate 69*-BSA.
- the sera were diluted 1:1000 and 10,000 with 1% BSA-PBS.
- Diluted sera 100 ⁇ L was added per well of the microtiter plate which was coated with 0.5 ⁇ g of the corresponding 69*-BSA.
- Detection was done using a HRP conjugated goat anti- rabbit secondary antibody diluted to 1:10000 and developed using the TMB substrate. Absorbance was measured at 450 nm and the data were plotted using the GraphPad prism software.
- Sera of 69*-CRM 197 formulation was tested against LPS isolated from different KPC strains #1-#4. In both cases, the sera was tested against the LPS (O1), Commercial-LPS (O2 a,c), LPS (O 2a), LPS (O5) and LPS (Gal III). Sera were diluted 1:200 with 1% BSA-PBS and 100 ⁇ L of the diluted sera was added per well of the microtiter plate which was coated with 1.0 ⁇ g of the corresponding LPS. Detection was done using a HRP conjugated goat anti-rabbit secondary antibody diluted to 1:10000 and developed using the TMB substrate. Absorbance was measured at 450 nm and the data were plotted using the GraphPad prism software. Examples A. Chemical synthesis General information:
- Compound 31* was prepared similarly to compound 21* starting from compound 5* and azido-PEG7-alcohol.
- Compound 37* was prepared similarly to compound 21* starting from compound 5* and 4-penten-1-ol.
- reaction mixture was then cooled to -78 °C and compound 41* (275 mg, 0.277 mmol) in DCM (5 mL) was added dropwise and stirred for 6 h at -78 °C and then warmed to 0 °C over 1 h.
- the reaction mixture was filtered and washed with sat. NaHCO 3 solution (25 mL) and extracted with CH 2 Cl 2 (2 x 35 mL). Combined organic layers were washed with brine (10 mL) and dried over anhydr Na 2 SO 4 Purification by automated purification system using silica (ethyl acetate/cyclohexane) afforded the product after evaporation of the solvent as a cloudy thick gel (220 mg, 54%).
- Compound 52* was prepared similarly to compound 43* starting from compound 5* and 11-azido-3,6,9-trioxaundecanol.
- Compound 53* was prepared similarly to compound 43* starting from compound 5* and 11-azido-3,6,9-trioxaundecanol.
- Reaction mixture was then cooled to ⁇ 78 °C and compound 66* (75 mg, 0.034 mmol) in DCM (1.5 mL) was added dropwise and stirred for 6 h at -78 °C and then warmed to -25 °C within 1 h.
- Reaction mixture was filtered and washed with sat. NaHCO 3 solution (15 mL) and extracted with CH 2 Cl 2 (2 x 25 mL). Combined organic layers were washed with brine (10 mL) and dried over anhydr. Na 2 SO 4 .
- Purification by automated purification system using silica (ethyl acetate/cyclohexane) afforded the product (as ⁇ / ⁇ mixture) after evaporation of the solvent as a cloudy thick gel (35 mg, 38%).
- Example 5 Synthesis of K. pneumoniae serotype O5 nonasaccharide Compound 70* To a solution of compound 63* (720 mg, 0.978 mmol) and 4-methoxyphenol (121 mg, 0.978 mmol) in anhydrous toluene (7.3 mL) and dioxane (2.5 mL) was added 4 ⁇ MS and the mixture was stirred at room temperature for 30 min. TMSOTf (18 ⁇ L, 0.098 mmol) was added and the reaction mixture stirred at -10 °C for 1 h. The reaction was quenched with sat. NaHCO 3 solution (35 mL) and extracted with DCM (2 x 50 mL).
- Reaction mixture was then cooled to -78 °C and compound 73* (300 mg, 0.303 mmol) in DCM (4 mL) was added dropwise and stirred for 6 h at -78 °C and then warmed to 0 °C within 1 h.
- Reaction mixture was filtered and washed with sat. NaHCO 3 solution (25 mL) and extracted with CH 2 Cl 2 (2 x 25 mL). Combined organic layers were washed with brine (10 mL), dried over anhydr. Na 2 SO 4 , and concentrated under reduced pressure.
- Purification by automated purification system using silica (ethyl acetate/cyclohexane) afforded the product after evaporation of the solvent as a cloudy thick gel (300 mg, 67%).
- the resin is washed with DCM, DMF and THF (3x, 2 mL, 25 s each) before swelling in DCM (2 mL) for 30 mins with occasional mixing using pulsed Argon bubbling.
- DCM (2 mL) is delivered into the reaction vessel, and the temperature is adjusted to - 20 °C.
- the DCM is drained and replaced by another 2 mL of DCM before TMSOTf solution (1 mL) is added dropwise.
- the mixture is incubated for 1.5 mins under Ar bubbling before draining washing with 2 mL DCM for 25 s.
- DCM (2 mL) is added to the resin and the temperature is set to the activation temperature T1- 2 K. While cooling down, the building block solution is delivered to the reaction vessel. After the set temperature has stabilized at T1 - 2 K, the reaction is started by adding 1 mL of activator solution. The mixture is kept at T1 for 5 minutes before a second 20 minute incubation cycle is started during which the temperature is raised to a temperature T2. Upon completion of the incubation cycle the reaction mixture is drained and the resin is washed once each with DCM:Dioxane 1:1 (2 mL) and DCM (2mL). The module finishes by raising the temperature to 25 °C while performing two additional DCM washes (2 mL).
- the resin is washed with DMF (3x, 2 mL, 25s) and the temperature of the reaction vessel is adjusted to 25 °C.2 mL of FMOC deprotection solution is delivered into the reaction vessel. After 5 mins, the solution was drained through the UV-sensor and the resin is washed with DMF (3x, 2 mL) and DCM (5x, 2mL, 60 s each). The temperature of the reaction vessel was decreased to -20 °C in preparation of the next cycle.
- the oligosaccharides were cleaved from solid support using a continuous flow photoreactor.
- DCM stabilized with amylene, LC-MS grade
- Wavelength 300 nm
- fresh DCM 20 mL
- the filtrate so obtained is concentrated in-vacuo and subjected to further analysis and purification. Purification and HPLC analysis
- ⁇ Detection antibody Goat anti rabbit IgG peroxidase conjugate (Sigma, #A4914) and Goat anti-Mouse IgG (H+L) peroxidase conjugate (Dianova Code: 115-035- 068).
- Blocking solution 1 % FCS (v/v) in PBS.
- Alum Aluminium Hydroxide Gel Adjuvant (Alhydrogel® 2%), Brenntag, Batch #:5447 Exp Dt: Feb 2020.
- the purified LPS were used as coating antigen in Enzyme Linked Immunosorbent Assay (ELISA).
- ELISA Enzyme Linked Immunosorbent Assay
- the KPC synthetic antigens were 21* and 69* conjugated to the carrier protein CRM197 (21*-CRM197 and 69*-CRM197) for immunization experiments and to Bovine Serum Albumin (BSA; (21*-CRM197 and 69*-CRM197)) as coating antigen for ELISA according to the procedure described below.
- BSA Bovine Serum Albumin
- Step 1 PNP-ester synthesis Compound 21* or 69* (1 eq) was dissolved in DMSO or DMSO-H 2 O at room temperature in a 8 mL vial. Activated bis-(4-nitrophenyl) adipate (20 eq) was added to it and stirred for 5 minutes.
- Step 2 Conjugation to the protein Conjugation procedure: The PNP ester of 21* or 69* in 50 ⁇ L of 0.15 M NaCl in NaPi buffer was added dropwise to the reaction vial containing CRM197 or BSA in buffer ( ⁇ 150 ⁇ L).
- the vial was finally rinsed with 50 ⁇ L of buffer solution and transferred to the reaction vial completely. Thus making the volume of the reaction in the vial ⁇ 200 ⁇ L. The reaction mixture became yellow in colour and stirred the reaction mixture at r.t. for 24h.
- the conjugate solution (21*-CRM197, 69*-CRM197, 21*-CRM197 or 69*-CRM197) was transferred to an Amicon® Ultra-0.5 mL centrifugal filter, centrifuged for 6 minutes at 2-8 °C.300 ⁇ L of buffer were added to the reaction vial, rinsed and transferred to the filter and centrifuged again. Additional washings were done using 1X PBS solution and centrifuging till the yellow colour was gone and the conjugate became clear solution. After the final wash the conjugate was stored in 1X PBS solution at 2-8 ⁇ C.
- the conjugates were analyzed by SDS-PAGE, SEC chromatography, and MALDI analysis.
- the loading of the sugar on the carrier was specifically calculated by subtracting the mass between the conjugated and unconjugated protein using MALDI analysis.
- the protein content was estimated using the micro BCA method following manufacture protocol.
- the samples were mixed in a microfuge tube and heated for 5 min at 95 °C on a thermocycler. After cooling to room temperature for 5 min, the samples at approximately 2,5 ⁇ g were loaded onto the respective wells of a 10 % polyacrylamide gel along with 10 ⁇ L of the marker. The samples were run at a constant voltage of 120V for 1 h. Staining was done using the GelCodeTM Blue Safe Protein Stain as per manufacture instructions. The gels were washed with deionized water overnight and scanned using the gel documentation system. 2.2 Size Exclusion Chromatography (SEC) of Glycoconjugates.
- SEC Size Exclusion Chromatography
- the glycoconjugates (21*-CRM 197 and 69*-CRM 197 ) used for immunization studies were analyzed by SEC to observe a mass difference between the conjugated and unconjugated CRM protein.
- the samples were diluted in 50 mM Tris, 20 mM NaCl, pH 7,2 and run on a Agilent 1100 HPLC system fitted with Tosoh TSK G2000 column (SWxl, 7.8 mm x 30 cm, 5 ⁇ m) and a Tosoh TSKgel® Guard Column (SWxl 6.0mm x 4cm, 7 ⁇ m). The flow rate was kept at 1 mL/min.
- glycoconjugates were formulated in aluminum hydroxide (alum) adjuvant for mice studies, and in Incomplete Freund’s Adjuvant (IFA) for immunization in rabbits. 3.1 Formulation in alum.
- the glycoconjugates (DS) and PBS were mixed in the appropriate pre-calculated ratio in a 50 mL FalconTM (0.25 mg/mL) required. This formed the DS-PBS mixture.
- the antigen/ DS dose per animal was kept at 5 ⁇ g/100 ⁇ L/animal.
- the DS-PBS mixture was gently mixed (5X) using a serological pipette.
- To the DS-PBS mixture the corresponding volume of stock alum (10 mg/mL) was added to give a final alum ratio of 1:40 or 0.250 mg/mL.
- the mixture was immediately mixed by gentle pipetting (20X) using a 5 mL serological pipette.
- the FalconTM tube was capped, wrapped with Parafilm® and allowed to mix on a shaker at 250 rpm for 2 h at room temperature (RT). After the incubation time of 2 h, the formulations were brought under the clean bench, aliquoted, and further stored at 4 °C till further use. 3.2 Formulation in IFA.
- IFA Incomplete Freund’s Adjuvant
- Protocol was followed as per manufacture.
- Antigen IFA concentration was kept at 1:1.
- the antigen dose per animal was kept at 5 ⁇ g/200 ⁇ L/animal (100 ⁇ L of antigen +100 ⁇ L IFA).
- IFA at the desired calculated volume (50% of the final immunization volume) was taken in a 15 mL sterile FalconTM tube.
- the calculated amount of the diluted antigen solution (volume adjusted with PBS to 50 % of the final immunization volume) was taken in a 3 mL sterile syringe, fitted with a 20 G needle.
- the DS solution was added into the FalconTM tube containing the IFA and immediately vortexed for 15 sec (5X). The color of the formulation changes from pale-yellow to milky-white on vortexing which indicates the formation of stable emulsion.
- the resulting vaccine formulation was briefly vortexed and aliquoted into 2mL sterile tubes with the desired dose volumes. Prior to immunizations, the tubes containing the vaccine formulations were vortexed and then injected into animals. 3.3 Characterization of Alum Formulations.
- the glycoconjugates formulated in alum were characterized to determine the final alum concentration and the pH of the formulations. 4. Immunization Schedule:
- mice and rabbit immunizations were performed under specific pathogen-free conditions and were provided food and water ad libitum.
- the antigen dose for mice was kept at 5 ⁇ g/animal except for the antigen-7 (2.5 ⁇ g each of antigen 1, and -2).
- the antigen dose for rabbit was kept at 5 ⁇ g/animal.
- Conjugates 21*-BSA and 69*-BSA, and LPS #1-#4 were used as the coating antigen.
- LPS was dissolved in isopropanol at a concentration of 10 / 20 ⁇ g/mL. 100 ⁇ L was used for coating each well resulting in a coating concentration of 1-2 ⁇ g/well. The LPS solutions were loaded into the well and subjected to overnight evaporation at r.t. inside the sterile bench.
- conjugates 21*-BSA and 69*-BSA the respective conjugates were dissolved at a concentration of 5 ⁇ g/mL in phosphate buffered saline (PBS) pH 7.4. 100 ⁇ L were coated per well and incubated overnight at 4°C to get an antigen concentration of 0.5 ⁇ g/well. Washing:
- the plates were washed 1X with PBS-T (200 ⁇ L/well) and the excess fluid per well was removed by inverting the plate and tapping on a clean dry tissue towel.
- the plates were blocked using 200 ⁇ L of the commercial blocking solution and incubated for 2h at RT.
- Incubation (detection antibody): The corresponding detection antibody, anti-rabbit or anti-mouse IgG HRP conjugate was diluted 1:10,000 in the antibody diluent (PBS+1% BSA) and 100 ⁇ L/well was added and incubated on a shaker at 250 rpm for 1h at RT. After the incubation with detection antibody, the plates were washed 5X with PBS-T (200 ⁇ L/well) and the excess fluid per well was removed by inverting the plate and by tapping on a clean dry tissue towel. Substrate addition:
- the KPC antigen glycoconjugates 21*-CRM 197 and 69*-CRM 197 used for the immunization studies were analyzed for the conjugation efficiency and antigen content.
- MALDI analysis of the glycoconjugates revealed a very good conjugation efficiency.
- the mass differences between the conjugated and unconjugated CRM 197 protein yielded a loading from 2– 15, preferably from 3– 10 antigens/ CRM 197 molecule for the different glycoconjugates.
- the glycoconjugates were also analyzed by a 10 % SDS-PAGE and SEC that revealed a clear mass shift as compared to the unconjugated CRM 197 protein (Fig 5A and Fig 5B).
- Sera from 21*-CRM 197 / 69*-CRM 197 immunized mice recognize the corresponding antigens (see Figure 6). The sera also cross-react with the corresponding K. pneumoniae LPS (see Figure 7). Sera from 21*-CRM 197 / 69*-CRM 197 immunized rabbits recognize the corresponding O-antigens in the related BSA conjugates 21*-BSA and 69*-BSA, respectively (see Figure 8). Sera from 21*-CRM 197 / 69*-CRM 197 immunized mice recognize selectively the corresponding K. pneumoniae LPS (see Figure 9).
- the herein provided data demonstrate that after immunization with a conjugate of the present invention, functional antibodies against oligosaccharides of the present invention as well as against the natural O-polysaccharides of K. pneumoniae serotypes O3, O3b and O5 were elicited in rabbits and mice.
- the Antibodies do cross-react with the natural O-polysaccharides (LPS) of K. pneumoniae serotypes O3, O3b and O5 indicating the potential of these antibodies to bind to K. pneumoniae bacteria and to confer protection against K. pneumoniae infection.
- the ELISA data further proves that the conjugates of the present invention are immunogenic and induce high antibody titers..
- ELISA analysis shows that the oligosaccharides of formula (I) of the present invention are immunogenic in rabbits and mice and generate cross reactive antibodies.
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US16/768,350 US11891413B2 (en) | 2017-11-30 | 2018-11-30 | Vaccine against Klebsiella pneumoniae |
CA3082951A CA3082951C (en) | 2017-11-30 | 2018-11-30 | Vaccine against klebsiella pneumoniae |
KR1020207018633A KR20200106033A (en) | 2017-11-30 | 2018-11-30 | Vaccine against Klebsiella pneumoniae |
EP18807679.8A EP3717498A1 (en) | 2017-11-30 | 2018-11-30 | Vaccine againstklebsiella pneumoniae |
JP2020529707A JP2021504438A (en) | 2017-11-30 | 2018-11-30 | Vaccine against Klebsiella pneumoniae |
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US11891413B2 (en) | 2024-02-06 |
CA3082951A1 (en) | 2019-06-06 |
EP3492481A1 (en) | 2019-06-05 |
CN111448204B (en) | 2024-05-14 |
US20210386845A1 (en) | 2021-12-16 |
AU2018375986A1 (en) | 2020-07-16 |
AU2018375986B2 (en) | 2023-12-07 |
CA3082951C (en) | 2024-01-30 |
KR20200106033A (en) | 2020-09-10 |
JP2021504438A (en) | 2021-02-15 |
EP3717498A1 (en) | 2020-10-07 |
CN111448204A (en) | 2020-07-24 |
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